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<div id="overview"><a href="../../../../../../../apidocs/org/apache/torque/engine/database/model/Unique.html">View Javadoc</a></div><pre>

<a name="1" href="#1">1</a>   <strong>package</strong> <a href="../../../../../../org/apache/torque/engine/database/model/package-summary.html">org.apache.torque.engine.database.model</a>;
<a name="2" href="#2">2</a>   
<a name="3" href="#3">3</a>   <em class="comment">/*</em>
<a name="4" href="#4">4</a>   <em class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
<a name="5" href="#5">5</a>   <em class="comment"> * or more contributor license agreements.  See the NOTICE file</em>
<a name="6" href="#6">6</a>   <em class="comment"> * distributed with this work for additional information</em>
<a name="7" href="#7">7</a>   <em class="comment"> * regarding copyright ownership.  The ASF licenses this file</em>
<a name="8" href="#8">8</a>   <em class="comment"> * to you under the Apache License, Version 2.0 (the</em>
<a name="9" href="#9">9</a>   <em class="comment"> * "License"); you may not use this file except in compliance</em>
<a name="10" href="#10">10</a>  <em class="comment"> * with the License.  You may obtain a copy of the License at</em>
<a name="11" href="#11">11</a>  <em class="comment"> *</em>
<a name="12" href="#12">12</a>  <em class="comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="13" href="#13">13</a>  <em class="comment"> *</em>
<a name="14" href="#14">14</a>  <em class="comment"> * Unless required by applicable law or agreed to in writing,</em>
<a name="15" href="#15">15</a>  <em class="comment"> * software distributed under the License is distributed on an</em>
<a name="16" href="#16">16</a>  <em class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a name="17" href="#17">17</a>  <em class="comment"> * KIND, either express or implied.  See the License for the</em>
<a name="18" href="#18">18</a>  <em class="comment"> * specific language governing permissions and limitations</em>
<a name="19" href="#19">19</a>  <em class="comment"> * under the License.</em>
<a name="20" href="#20">20</a>  <em class="comment"> */</em>
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <strong>import</strong> java.util.List;
<a name="23" href="#23">23</a>  
<a name="24" href="#24">24</a>  <em>/**<em>*</em></em>
<a name="25" href="#25">25</a>  <em> * Information about unique columns of a table.  This class assumes</em>
<a name="26" href="#26">26</a>  <em> * that in the underlying RDBMS, unique constraints and unique indices</em>
<a name="27" href="#27">27</a>  <em> * are roughly equivalent.  For example, adding a unique constraint to</em>
<a name="28" href="#28">28</a>  <em> * a column also creates an index on that column (this is known to be</em>
<a name="29" href="#29">29</a>  <em> * true for MySQL and Oracle).</em>
<a name="30" href="#30">30</a>  <em> *</em>
<a name="31" href="#31">31</a>  <em> * @author &lt;a href="<a href="mailto:jvanzyl@apache.org" target="alexandria_uri">mailto:jvanzyl@apache.org</a>">Jason van Zyl&lt;/a></em>
<a name="32" href="#32">32</a>  <em> * @author &lt;a href="<a href="mailto:dlr@collab.net" target="alexandria_uri">mailto:dlr@collab.net</a>">Daniel Rall&lt;/a></em>
<a name="33" href="#33">33</a>  <em> * @version $Id: Unique.java 473814 2006-11-11 22:30:30Z tv $</em>
<a name="34" href="#34">34</a>  <em> */</em>
<a name="35" href="#35">35</a>  <strong>public</strong> <strong>class</strong> <a href="../../../../../../org/apache/torque/engine/database/model/Unique.html">Unique</a> <strong>extends</strong> <a href="../../../../../../org/apache/torque/engine/database/model/Index.html">Index</a>
<a name="36" href="#36">36</a>  {
<a name="37" href="#37">37</a>      <em>/**<em>*</em></em>
<a name="38" href="#38">38</a>  <em>     * Returns &lt;code>true&lt;/code>.</em>
<a name="39" href="#39">39</a>  <em>     *</em>
<a name="40" href="#40">40</a>  <em>     * @return true</em>
<a name="41" href="#41">41</a>  <em>     */</em>
<a name="42" href="#42">42</a>      <strong>public</strong> <strong>final</strong> <strong>boolean</strong> isUnique()
<a name="43" href="#43">43</a>      {
<a name="44" href="#44">44</a>          <strong>return</strong> <strong>true</strong>;
<a name="45" href="#45">45</a>      }
<a name="46" href="#46">46</a>  
<a name="47" href="#47">47</a>      <em>/**<em>*</em></em>
<a name="48" href="#48">48</a>  <em>     * String representation of the index. This is an xml representation.</em>
<a name="49" href="#49">49</a>  <em>     *</em>
<a name="50" href="#50">50</a>  <em>     * @return string representation in xml</em>
<a name="51" href="#51">51</a>  <em>     */</em>
<a name="52" href="#52">52</a>      <strong>public</strong> String toString()
<a name="53" href="#53">53</a>      {
<a name="54" href="#54">54</a>          StringBuffer result = <strong>new</strong> StringBuffer();
<a name="55" href="#55">55</a>          result.append(<span class="string">" &lt;unique name=\&quot;"</span>)
<a name="56" href="#56">56</a>              .append(getName())
<a name="57" href="#57">57</a>              .append(<span class="string">"\&quot;>\n"</span>);
<a name="58" href="#58">58</a>  
<a name="59" href="#59">59</a>          List columns = getColumns();
<a name="60" href="#60">60</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; columns.size(); i++)
<a name="61" href="#61">61</a>          {
<a name="62" href="#62">62</a>              result.append(<span class="string">"  &lt;unique-column name=\&quot;"</span>)
<a name="63" href="#63">63</a>                  .append(columns.get(i))
<a name="64" href="#64">64</a>                  .append(<span class="string">"\&quot;/>\n"</span>);
<a name="65" href="#65">65</a>          }
<a name="66" href="#66">66</a>          result.append(<span class="string">" &lt;/unique>\n"</span>);
<a name="67" href="#67">67</a>          <strong>return</strong> result.toString();
<a name="68" href="#68">68</a>      }
<a name="69" href="#69">69</a>  }
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